[I] dubbo protocol and dubbo-go-hessian2 can not process (*int32)(nil) corner case [dubbo-go]

[via GitHub]

DMwangnima opened a new issue, #2517:
URL: https://github.com/apache/dubbo-go/issues/2517

   ### Environment
   
   - Server: Dubbo-go, v3.1.0
   - Client: Dubbo-go, v3.1.0
   - Protocol: Dubbo
   
   ### Issue description
   
   <!-- Here is a brief description about the issue. -->
   
   #### defining API
   ```go
   type UserProvider struct {
       Echo func(ctx context.Context, req *int32) (*int32, error)
   }
   ```
   
   #### client logic
   ```
   resp, err := cli.Echo(context.Background(), (*int32)(nil))
   ```
   
   #### dubbo-go-hessian2
   <img width="873" alt="image" 
src="https://github.com/apache/dubbo-go/assets/33331974/13d14ee5-ef33-45ba-aa4e-982e88d5631d";>
   
   Judging ```v == nil``` is not enough since ```(*int32)(nil)``` has type 
information.
   
   #### dubbo-go
   /protocol/dubbo/impl/hessian.go
   <img width="761" alt="image" 
src="https://github.com/apache/dubbo-go/assets/33331974/21f11321-348a-4c84-b0b5-9f5c4795be68";>
   
   ignore encoding error does not make any sense.
   
   ### Logs
   
   <details><summary>Click me to check logs</summary>
   
   ```
   Copy logs to here.
   ```
   
   </details>
   


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